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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第2期11卷 80-87页

作者： Xian-zhi WANG Jun-jie ZHENG Jian-hua YIN Department of Water Resources Guangdong Technical College of Water Resources and Electric Engineering Guangzhou 510635 China School of Civil Engineering and Mechanics Huazhong University of Science & Technology Wuhan 430074 China Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China

Aphysical model facility was designed, built, and setup for conducting model tests on a composite foundation in a soil ground. The model tests were carried out on a composite foundation with different combinations of vertical reinforcement elements in the same soil ground. Via the analysis of the collected data the characteristics of the composite foundation with different reinforcing elements were obtained, including the characteristics of load-settlement curves, column stresses, stresses of the intercolumn soil, pile-soil stress ratio, and load-sharing ratios of columns and soil. Results from the model tests reveal the mechanism of a composite foundation with different reinforcing elements quantitatively. It is concluded that both a composite foundation with a combination of steel pipe pile and sand column and that with a combination of concrete pile and lime column have a higher bearing capacity than the composite foundation with only sand columns with the same conditions of soil ground and loading. A composite foundation with lime column and sand column embodies no much better performance than that with sand colunms only.

关键词： Steel pipe pile Concrete pile Lime column Sand column Composite foundation Model test pile-soil stress ratio

Performance of X-Section Concrete pile Group in Coral Sand Under Vertical Loading

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China Ocean Engineering 2020年第5期34卷 621-630页

作者： PENG Yu LIU Jia-yi DING Xuan-ming FANG Hua-qiang JIANG Chun-yong College of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China CCTEG Chongqing Engineering Co. LtdGeotechnical Engineering InstituteChongqing 400042China

To reveal the bearing capacity of the X-section pile group in coral sand, a series of model load tests are *** testing results are presented as load-settlement curves, pile-soil stress ratios, distributions of side friction and axial force, and load-sharing ratio between side and tip resistances. The reliability and accuracy of the numerical simulation model are verified by comparing the results of the model test. Comparative analysis between X-section and circular section piles with the same cross-sectional area indicates that the bearing capacity of the X-section pile group is much larger than that of the circular pile group. The axial force of X-section piles is smaller while the peak skin friction is larger than that of circular piles at the same depth. The skin friction of the core pile is the largest,followed by the side pile and the corner pile is the smallest when the load is relatively small;however, it is converse when the load is larger than 10 k N. Compared with piles in silica sand, the pile in coral sand has a lower bearing capacity, and the sand breakage leads to the steep drop failure of pile foundation. Moreover, pile positions under the raft have less effect on the load-share differences among corner, side and core piles in coral sand. This study provides a reference for the construction of pile foundations in coral sand.

关键词： X-section pile group coral sand model test numerical analysis pile-soil stress ratio

Model test on vertical bearing capacity of X-section concrete pile raft foundation in silica sand

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Journal of Central South University 2020年第6期27卷 1861-1869页

作者： XU Lai PENG Yu DING Xuan-ming LIU Jia-yi Guangdong Zhonggong Architectural Design Institute Co. Ltd.Guangzhou 510670China College of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China CCTEG Chongqing Engineering Co. LtdGeotechnical Engineering InstituteChongqing 400042China

To reveal the bearing capacity of the X-section concrete piles pile raft foundation in silica sand,a series of vertical load tests are carried *** X-section concrete piles are compared with circular section pile with the same section *** load−settlement curves,axial force and skin friction,strain on concave and convex edge of the pile,pile-sand stress ratio,distributions of side and tip resistance are *** results show that bearing capacity of the X section concrete pile raft foundation is much larger than that of the circular pile raft ***,compared with the circular pile,the peak axial force of X-section piles under raft is deeper and smaller while the neutral point of X-section concrete pile is ***,the strain on the concave edge is much larger than that on the convex edge of the pile,and the convex edge has more potential in bearing capacity as the vertical load *** X-section pile has higher pile-sand stress ratios and load-sharing between side resistance and tip *** all,the X-section concrete pile can significantly increase the bearing capacity of pile-raft foundations in silica sand.

关键词： X-section pile pile raft foundation model test neutral point pile-soil stress ratio

Experiments of Multi-element Composite Foundation with Steel Pipe pile and Gravel pile

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Journal of Southwest Jiaotong University(English Edition) 2008年第3期16卷 254-259页

作者：王仙芝郑俊杰 School of Civil Engineering and Mechanics Huazhong University of Science and Technology

A set of serf-developed apparatus for foundation physical model were utilized to conduct model tests of the multi-element composite foundation with a steel pipe pile and several gravel piles. Some load-bearing characteristics of the multi-element Composite foundation, including the curves of foundation settlement, stresses of piles, pile-soil stress ratio, and load-sharing ratio of piles and soil, were obtained to study its working performances in silty sand soil. The experimental results revealed that the multi-element composite foundation with steel pipe pile and gravel pile contributed more than the gravel pile composite foundation in improving the bearing capacity of the silty fine sand.

关键词： Steel pipe pile Gravel pile Model test Multi-element composite foundation pile-soil stress ratio Load-sharing ratio